package com.xxxx.server.config;

import com.xxxx.server.config.security.component.JwtTokenUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.simp.config.ChannelRegistration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.messaging.simp.stomp.StompCommand;
import org.springframework.messaging.simp.stomp.StompHeaderAccessor;
import org.springframework.messaging.support.ChannelInterceptor;
import org.springframework.messaging.support.MessageHeaderAccessor;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.util.StringUtils;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;

/**
 * WebSocket配置类
 *
 * @author zhoubin
 * @since 1.0.0
 */
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
	@Value("${jwt.tokenHead}")
	private String tokenHead;
	@Autowired
	private JwtTokenUtil jwtTokenUtil;
	@Autowired
	private UserDetailsService userDetailsService;


	/**
	 * 添加这个Endpoint，这样在网页可以通过websocket连接上服务
	 * 也就是我们配置websocket的服务地址，并且可以指定是否使用socketJS
	 * @param registry
	 */
	@Override
	public void registerStompEndpoints(StompEndpointRegistry registry) {
		/**
		 * 1.将ws/ep路径注册为stomp的端点，用户连接了这个端点就可以进行websocket通讯，支持socketJS
		 * 2.setAllowedOrigins("*")：允许跨域
		 * 3.withSockJS():支持socketJS访问
		 */
		registry.addEndpoint("/ws/ep").setAllowedOrigins("*").withSockJS();
	}


	/**
	 * 输入通道参数配置
	 * @param registration
	 */
	@Override
	public void configureClientInboundChannel(ChannelRegistration registration) {
		registration.interceptors(new ChannelInterceptor() {
			@Override
			public Message<?> preSend(Message<?> message, MessageChannel channel) {
				StompHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, StompHeaderAccessor.class);
				//判断是否为连接，如果是，需要获取token，并且设置用户对象
				if (StompCommand.CONNECT.equals(accessor.getCommand())){
					String token = accessor.getFirstNativeHeader("Auth-Token");
					if (!StringUtils.isEmpty(token)){
						String authToken = token.substring(tokenHead.length());
						String username = jwtTokenUtil.getUserNameFromToken(authToken);
						//token中存在用户名
						if (!StringUtils.isEmpty(username)){
							//登录
							UserDetails userDetails = userDetailsService.loadUserByUsername(username);
							//验证token是否有效，重新设置用户对象
							if (jwtTokenUtil.validateToken(authToken,userDetails)){
								UsernamePasswordAuthenticationToken authenticationToken =
										new UsernamePasswordAuthenticationToken(userDetails, null,
												userDetails.getAuthorities());
								SecurityContextHolder.getContext().setAuthentication(authenticationToken);
								accessor.setUser(authenticationToken);
							}
						}
					}
				}
				return message;
			}
		});
	}

	/**
	 * 配置消息代理
	 * @param registry
	 */
	@Override
	public void configureMessageBroker(MessageBrokerRegistry registry) {
		//配置代理域，可以配置多个，配置代理目的地前缀为/queue,可以在配置域上向客户端推送消息
		registry.enableSimpleBroker("/queue");
	}
}